<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>

  <script>

    const obj = { name: "zs", age: 18 };

    const xiaoming = {
      ...obj,  // 会把obj所有的键值对，复制一份
      name: "小明" // name会覆盖掉旧的name
    }
    console.log('xiaoming  ----->  ', xiaoming);

  </script>

</body>

</html>